NDLI: Adhesive evaluation of water-soluble larc-tpi

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Adhesive evaluation of water-soluble larc-tpi

Content Provider	NASA Technical Reports Server (NTRS)
Author	Progar, Donald J. Pike, Roscoe A.
Copyright Year	1987
Description	The water-soluble polyimide, identified as TPI(MTC)/H2O, was evaluated as a high temperature thermoplastic adhesive for bonding Ti-6Al-4V and comparing those results primarily with results reported in earlier work with the polyamic-acid/diglyme material. The lap shear strength test was the primary test performed to evaluate the adhesive before (controls) and after thermal exposure in air at 204 C for up to 5000 hours and after a 72 hour water-boil exposure. Lap shear strengths were determined at RT, 177, 204, and 232 C. The adhesive was also characterized after fracture by determining the glass transition temperature as well as defining the mode of failure by visual observation. In general, the results indicate that the TPI(MTC)/H2O retains high lap shear strengths after thermal exposure but had reduced strengths after the water-boil exposure. All failures were cohesive. The TPI(MTC)/H2O compared very well with previous data reported for the standard polyamic-acid/diglyme LARC-TPI results, and therefore, shows promise as a water-soluble adhesive for use in various applications.
File Size	1009027
Page Count	29
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870014319
Archival Resource Key	ark:/13960/t5dc2xg2v
Language	English
Publisher Date	1987-06-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Water Fracture Mechanics Failure Analysis Polyimides Solubility Shear Strength Titanium Synthesis Chemistry Adhesive Bonding Metal-metal Bonding Thermoplasticity Glass Transition Temperature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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